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4.10.2 HORIZONTALHorizontal Flue Arrangements.The boiler can be flued horizontally if required via a 90 degree elbow, flexistainless steel flue pipe and a through side adaptor.Adequate provision to stop the ingress of external water into the flue system mustbe made.Where the flue system is within 150 mm of any combustible materials it must beinsulated and securely wrapped with foil-backed duct wrap minimum 25 mm thick.There must be no area of the flue pipe which is uninsuated.The insulation materials must be securely and adequately fixed to the flue system.4.11 VENTILATION.Adequate ventilation must be provided and this will be calculated at 5cm sq per kWof output.If the appliance is fitted with a balanced flue system in a compartment, high andlow level ventilation must be provided for compartment cooling purposes.16